Rgb leds for a tachometer light array

ABSTRACT

The presented invention is a low profile light bar tachometer display which includes a plurality of RGB LEDs or similar RGB color model light-emitting devices organized and arrayed in a segmented, flexible tachometer case that can be manipulated and contoured to conform to the top of the dash assembly of an automobile or any surface deemed suitable for the needs of the driver of an automobile. The lights provide a highly visible, illuminated, color changing display, so the driver can immediately assess the engine&#39;s RPM, power band, redline, or maximum torque from the change in light color or light position. The light array provides a repeatable, reliable and adjustable indication of the usable range of the engine&#39;s rpm, but does not indicate actual rpm.

CROSS-REFERENCED TO RELATED APPLICATIONS

This is a continuation of application Ser. No. 13/015,535 filed on Jan.27, 2011.

FIELD OF THE INVENTION

The presented invention relates to tachometers in general, and moreparticularly to a flexible light bar tachometer case employing an arrayof light-emitting devices, providing a highly visible illuminateddisplay that contours to the top of the dash assembly of an automobile.

BACKGROUND OF THE INVENTION

When driving a vehicle at high speed, it is dangerous to look atanything other than the road directly ahead. It is especially dangerousto look down at the dashboard display to read the tachometer orspeedometer; not only may the vehicle travel a considerable distancewhile the gaze is averted, but the eyes take time to refocus when thedriver looks down at the dashboard and then up to the road again. Duringthat refocusing time critical events may take place that the driver maynot fully perceive because of the delay in focusing. Further, theconventional numerical displays (whether digital or analog) require sometime for interpretation. This is because the numbers symbolize andsignify something and require at least a moment of cognition toascertain what action, if any, to take in view of the informationprovided. Accordingly, racers using conventional tachometersoccasionally simply memorize needle locations or make an educated guessas to actual engine RPM by considering other factors, such as enginesound.

Current known solutions to avoid the gaze-shifting problem includemounting the tachometer on the hood of the car or mounting thetachometer on top of the dash within the driver's general line of sightbut, due to their sheer size, tachometers mounted on dashboards obstructvision in some measure. Whether the tachometer is mounted within thedriver's general line of sight or moved to one side, the driver's gazeis required to be shifted or averted from the road to view it.

Another proposed solution has been to “clock” the tachometer. “Clocking”entails rotating the tachometer in its housing, such that when thetachometer is indicating redline, the needle points straight up or inanother preferred direction.

Other proposed solutions were the addition of shift lights to simplifythe interpretation of shift points, or to add a pre-set indicator needleto the tachometer display. Adding a preset needle provides thetachometer with adjustability for a specific redline, so when the movingneedle aligns with the pre-set indicator needle, the engine's redline orshift point is more easily determined.

These previous solutions improve, but do not eliminate, thegaze-shifting problem. Additionally, these solutions also do not makethe determination of redline, or engine RPM, significantly easier forthe driver to assess.

SUMMARY OF THE INVENTION

The presented invention is a flexible low profile, light bar tachometerthat incorporates an array of lights that provide the driver of avehicle with a dramatic visual prompt, for shifting up or down and theability to visually monitor the engine's RPM range. The illuminatedlight bar display of the presented invention employs a row of lightsarrayed in a flexible tachometer case that can be manipulated andcontoured to conform to the top of the dash assembly of an automobile orany other surface deemed suitable for the needs of the driver. Theflexible low profile light bar tachometer provides a reliableilluminated visual reference of the usable range of an engine's RPMwithout obstructing the driver's vision because it is designed for thedriver to utilize peripheral vision to monitor the tachometer display.

In a preferred embodiment, RGB LEDs or lights that can change color areemployed. Since this preferred light array includes RGB LED lights thatcan emit different color frequencies, the lights are driven such thatthe entire light array, to the extent that the illuminated lights havetraveled sequentially across the display, change to the next chosencolor. The driver can immediately assess the engine's RPM from lightcolor or light position and the light array can display different colorsto signify important RPM ranges or values such as power band, redlineand maximum torque. A circuit connected to the headlight switch of thevehicle detects voltage to the headlights, such that during night or lowlight conditions the tachometer display can be dimmed.

Numerous methods are known for measuring engine and/or rotating shaftRPM, including the use of optoelectronic devices, voltage pulses, and,of course, the outdated technology of cables connected by gears to adrive shaft. The presented invention contemplates the use of any systemand method of measuring engine RPM, which is then decoded and displayedin the presented invention.

It is therefore a first and principal object of the invention to displaythe usable range of engine RPM.

It is another object of the invention to provide a tachometer displaythat facilitates viewing through peripheral vision, rather thanrequiring direct viewing by the driver of a vehicle.

It is another object of the invention to provide an indication of theusable range of engine RPM through the use of color changing lights.

It is another object of the invention to provide a flexible light bartachometer display that includes a light intensity adjustment.

It is another object of the invention to provide a flexible light bartachometer case that can be manipulated and contoured to conform to thetop of the dash assembly of an automobile or any surface deemed suitablefor the needs of the driver.

It is another object of the invention to provide a color changing lightarray employing RGB LEDs or any similar light-emitting device that wouldsatisfy the requirements of the application.

The invention will be better understood and objects other than those setforth above will become apparent when consideration is given to thefollowing brief description thereof and the presented contribution tothe art may be better appreciated.

BRIEF DESCRIPTION OF THE DRAWINGS

A general understanding of the presented invention may be obtained byreference to the accompanying drawings, when considered in conjunctionwith the subsequent brief description, in which:

FIG. 1 is a front view of a center case segment;

FIG. 2 is an upper right front perspective view of the center casesegment shown in FIG. 1;

FIG. 3 is a front view of two center case segments linked together;

FIG. 4 is an upper right front perspective view of the two center casesegments linked together shown in FIG. 3;

FIG. 5 is a front view of a left case segment;

FIG. 6 is an upper right front perspective view of the left case segmentshown in FIG. 5;

FIG. 7 is a front view of a right case segment;

FIG. 8 is an upper right front perspective view of the right casesegment shown in FIG. 7;

FIG. 9 is a front view of a straight segment chain;

FIG. 10 is an upper right front perspective view of the straight segmentchain shown in FIG. 9;

FIG. 11 is a front view of a curved segment chain;

FIG. 12 is an upper right front perspective view of the curved segmentchain shown in FIG. 11;

FIG. 13 is a front view of a combined curved segment chain;

FIG. 14 is an upper right front perspective view of the combined curvedsegment chain shown in FIG. 13;

FIG. 15 is an upper right front perspective view of a left case segmentend cap;

FIG. 16 is an upper right front perspective view of a center casesegment end cap with an aperture for an RGB LED;

FIG. 17 is an upper right front perspective view of a right case segmentend cap with an aperture for an RGB LED;

FIG. 18 is a front view of a low profile flexible light bar tachometer;

FIG. 19 is an upper right front perspective view of the low profileflexible light bar tachometer shown in FIG. 18;

FIG. 20 is a front view of a curved low profile flexible light bartachometer;

FIG. 21 is a front view of the curved low profile flexible light bartachometer shown in FIG. 20, mounted on the top of a dash assembly of anautomobile;

FIG. 22 is an upper right front perspective view of a curved low profileflexible light bar tachometer shown in FIG. 20;

FIG. 23 is an upper right front perspective view of the curved lowprofile flexible light bar tachometer shown in FIG. 20 mounted on thetop of a dash assembly of an automobile;

It has thus been briefly outlined the more important features of theinvention in order that the detailed description thereof that followsmay be better understood, and in order that the presented contributionto the art may be better appreciated. There are, of course, additionalfeatures of the invention that will be described hereinafter and whichwill form additional subject matter of the claims appended hereto. Thoseskilled in the art will appreciate that the conception upon which thisdisclosure is based may be readily utilized as a basis for the designingof other structures, methods and systems for carrying out the severalpurposes of the presented invention. It is important, therefore, thatthe claims be regarded as including such equivalent constructionsinsofar as they do not depart from the spirit and scope of the presentedinvention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to, wherein like reference numerals refer to like componentsin the various views, a complete understanding of the presentedinvention may be obtained by reference to the accompanying drawings inthis detailed description of a new low profile flexible light bartachometer.

The preferred embodiment, demonstrated in the following example,describes rigid segments that can interlink with additional rigidsegments, creating a flexible tachometer case of unlimited potentiallength. The rigid segments in the preferred embodiment are constructedof acrylic plastic but could be fabricated out of metal or any othermaterial suitable for the application. The use of rigid segments thatare movable in relation to each other, and are the preferred means ofcreating a flexible tachometer case, do not in any way limit thepractice of the invention to the use of rigid segments. A flexiblematerial such as silicon, vulcanized rubber, or any other appropriatematerial could be used as a means for creating a flexible tachometercase to hold the tachometer's electronic components as long as thematerial's properties were sufficient to house said components, whileallowing the tachometer case to be manipulated and contoured to conformto the top of an automobile dash assembly or any other surface deemedsuitable for the application.

The light array in the preferred embodiment employs a plurality of RGBLEDs, defined more specifically as Light-Emitting Diodes utilizing theRGB color model. The RGB color model is an additive color model in whichRed, Green and Blue light are added together in various ways toreproduce a broad array of colors. The name “RGB” comes from theinitials of the three additive primary colors: Red, Green, and Blue. RGBLEDs are also referred to as multi-colored white LEDs or tri-color LEDs.By blending and varying the intensity of each primary color, manydifferent colors can be displayed allowing a precise dynamic colorcontrol.

Although the preferred embodiment employs a plurality of RGB LEDs as thelight array, the light array is certainly not limited to the use of RGBLEDs. Other light-emitting devices that utilize the RGB color modelcould also be used in the light array and the presented inventionincludes the use of all similar RGB color model light-emitting devicesfor creating a light display. All RGB LEDs and similar RGB color modellight-emitting devices herein will be referred to collectively as RGBLED or RGB LEDs.

In this preferred embodiment, RGB LED lights that can change color, areemployed and since this preferred light array includes lights that canemit different color frequencies, the lights are driven such that theentire light array, to the extent that the illuminated lights havetraveled across the display, change to the next chosen sequential color.

In the presented invention, four different colors are employed, eachcolor representing a predetermined range of RPM. However, there is noessential requirement that four colors be employed, and in fact only twocolors could be employed, with one color to signify when a critical RPMhas been achieved. Alternatively, a much greater number of colors couldbe employed with colors changing gradually across the array. In fact,there could be any number of lights in the array as well as anycombinations of colors. The light array could be progressivelyilluminated in various configurations. Examples of these configurationscould be a converging display, diverging display or any progressivesequence deemed suitable for the application.

FIG. 1 shows a front view of a center case segment 300, which iscomprised of an external cylinder surface 100, an internal cylindersurface 110, two case extensions 140, two case slots 130, a circuitboard mounting slot 120 and a circuit board cavity 160.

FIG. 2 shows a perspective view of the center case segment 300 shown inFIG. 1, with a circuit board 220 inserted into the circuit boardmounting slot 120 and an RGB LED 210 positioned on the circuit board220.

FIG. 3 shows a front view of two center case segments 300 demonstratinghow said center case segments are linked together. The two center casesegments 300 are linked by coaxially aligning the external cylindersurface 100 with the internal cylinder surface 110 and aligning the caseextensions 140 with the case slots 130. The two center case segments 300are then slid together until the ends are flush, as illustrated in thisfigure. The two center case segments 300 are then movable 150 inrelation to each other to the extent that one of the case extensions 140bottoms out in the case slot 130, limiting the movement.

FIG. 4 shows a perspective view of the two linked center case segments300 shown in FIG. 3.

FIG. 5 shows a front view of a left case segment 310, which is comprisedof an internal cylinder surface 110, a left case cavity 170 and two caseextensions 140.

FIG. 6 shows a perspective view of the left case segment 310 shown inFIG. 5.

FIG. 7 shows a front view of a right case segment 320 which is comprisedof an external cylinder surface 100, a circuit board mounting slot 120,a circuit board cavity 160, a right case cavity 180 and two case slots130.

FIG. 8 shows a perspective view of the right case segment 320 shown inFIG. 7.

FIG. 9 shows a front view of 16 linked center case segments 300 linkedto a left case segment 310 and a right case segment 320, creating aplurality of case segments, herein referred to collectively as a“segment chain 400”, resulting in a segment chain 400 that canuniversally accommodate a variety of contours and/or surfaces such as,but not limited to, the curvature found on the top of an automobile dashassembly 230. The quantity of center case segments 300 utilized couldpotentially be any amount and is certainly not limited to 16 asdemonstrated in this example. The actual quantity of center casesegments 300 utilized would simply create a segment chain 400 ofsufficient length that would satisfy the requirements of a particularapplication.

The plurality of center case segments 300 and the one right case segment320, each house a small circuit board 220 with an attached RGB LED 210,best illustrated by FIGS. 2-4, that is inserted into each circuit boardmounting slot 120 located inside each circuit board cavity 160. Thecircuit board 220 and attached RGB LED 210 in each circuit board cavity160 is connected to each other with a cable or a sufficient number ofwires needed for the application to provide power and a signal to drivethe RGB LED 210.

The plurality of RGB LEDs 210 used in this application are purchasedfrom Hebei I.T. (Shanghai) Co., Ltd., a Chinese manufacturer of variouselectronic components but mostly LED lights. Any other similarlight-emitting device that would satisfy the requirements of thisapplication could be used and is certainly not limited to any specificmanufacturer or device. The circuit board 220 holds some of theelectronic components and is electrically connected (not shown) to thevehicle's (12 V) source of electrical power, the vehicle's headlightpower circuit, ground, and the electronic tachometer signal.

FIG. 10 shows a perspective view of the segment chain 400 shown in FIG.9.

FIG. 11 shows a front view of the segment chain 400 that has beenmanipulated to follow a curve such as the curve of the top of the dashassembly 230 of an automobile.

FIG. 12 shows a perspective view of the segment chain 400 shown in FIG.11.

FIG. 13 shows a front view of the segment chain 400 contoured in acombined curve. This figure more clearly demonstrates the flexibility ofthe segment chain 400.

FIG. 14 shows a perspective view of the segment chain 400 shown in FIG.13.

FIG. 15 shows a perspective view of a left case segment end cap 340 thatis designed to be affixed to the end of the left case segment 310, asshown in FIGS. 5 and 6, enclosing the left case cavity 170. The leftcase segment end cap 340 captures the relative segments of the segmentchain 400 so they cannot slide apart, but are still movable 150 inrelation to each other as illustrated in FIGS. 3 and 4.

FIG. 16 shows a perspective view of a center case segment end cap 330that is designed to be affixed to the end of a center case segment 300,as shown in FIGS. 1-4, enclosing the circuit board cavity 160. Itincorporates an aperture 370 that houses the RGB LED 210 allowing thetransmission of light from within the circuit board cavity 160 or theaperture could be utilized as a form of stability for the RGB LED. TheRGB LED 210 is mounted on a circuit board 220, as shown in FIGS. 2 and4, that is inserted into the circuit board mounting slot 120, aligningwith the aperture 370. The center case segment end cap 330 captures therelative segments of the segment chain 400 so they cannot slide apart,but are still movable 150 in relation to each other as illustrated inFIGS. 3 and 4.

FIG. 17 shows a perspective view of a right case segment end cap 350that is designed to be affixed to the end of a right case segment 320,as shown in FIGS. 7 and 8, enclosing the right case cavity 180 and thecircuit board cavity 160. It incorporates an aperture 370 that housesthe RGB LED 210 allowing the transmission of light from within thecircuit board cavity 160 or the aperture could be utilized as a form ofstability for the RGB LED.

The RGB LED 210 is mounted on a circuit board 220, as shown in FIGS.2-4, that is inserted into the circuit board mounting slot 120, andaligned with the aperture 370. The right case segment end cap 350captures the relative segment of the segment chain 400 so they cannotslide apart, but are still movable 150 in relation to each other asillustrated in FIGS. 3 and 4.

FIG. 18 shows a front view of a low profile flexible light bartachometer 410 comprising a plurality of center case segment end caps330, a plurality of left case segment end caps 340, a plurality of rightcase segment end caps 350 herein referred to collectively as “segmentend caps 360” affixed to the segment chain 400, with the plurality ofRGB LEDs 210 disposed on a plurality of circuit boards 220 containedwithin the segment chain 400, connected to some of the electroniccomponents and needed wiring (not shown).

Although FIGS. 15-17 demonstrate a specific design for the segment endcaps 360, the diagram shown does not in any way limit the practice ofthe invention to the use of to these specific shapes. The segment endcaps 360 could be of any design as long as they, provide an aperture 370in which the circuit board 220 and RGB LED 210 is positioned to allowthe transmission of light or stabilize the RGB LED, prevent the segmentchain 400 segments from sliding apart, and allow the free movement ofthe segment chain 400 segments in relation to one another.Alternatively, the segment end caps could be incorporated into thedesign of the segments, provided the segments were able to be movable inrelation to one another. One such example would be that a segment endcap be incorporated into one end of a segment with the end cap on theother end of the segment having to be attached to the segment in somemanner.

The segment end caps 360 on the opposite end (not shown) of the segmentchain 400, although similar in design, do not incorporate an aperture370. These segment end caps 360 reasonably seal the opposite end of eachof the segment chain 400 while allowing free movement of the segmentchain 400 segments. The end cap inner curved surface 380 and the end capouter curved surface 390 rotate in relation to each other providing anacceptable finished appearance to the front of the segment chain 400.

FIG. 19 shows a perspective view of the low profile flexible light bartachometer 410 shown in FIG. 18.

FIG. 20 shows a front view of the low profile flexible light bartachometer 410 manipulated and contoured to conform to a curve similarto, but not limited to, the curve of the top of the dash assembly 230 ofan automobile.

FIG. 21 shows a front view of low profile flexible light bar tachometer410 contoured to follow the curve on the top of the dash assembly 230 ofan automobile and the instruments or gauges 240 positioned under thedash assembly 230. In this example, the curve of the top of the dashassembly 230 is the demonstrated curve, however, there are other curvesor surfaces that the low profile flexible light bar tachometer 410 couldaccommodate and is certainly not limited to the curve on the top of thedash assembly 230. The surface utilized is whatever is determined to bethe most suitable for the application. The low profile flexible lightbar tachometer 410 can be attached to the top of the dash assembly 230,or whatever surface satisfies the installation requirements, with Velcroor any other means suitable for a particular application.

FIG. 22 shows a perspective view of the low profile flexible light bartachometer 410 shown in FIGS. 18-21.

FIG. 23 shows a perspective view of the low profile flexible light bartachometer 410 shown in FIGS. 18-22 mounted on top of the dash assembly230 and the instruments or gauges 240 of an automobile. This preferredembodiment features the plurality of RGB LEDs 210 countersunk in theplurality of apertures 370 of the segment end caps 360 preventingsunlight or any other light source from shining directly on them. This,however, does not limit the plurality of RGB LEDs 210 to beingcountersunk in the plurality of apertures 370 of the segment end caps360. If so desired, the plurality of RGB LEDs 210 could be extended tothe outside of the segment chain 400, as long as the emitted light wassatisfactorily visible to the driver.

The RGB LEDs 210 or any similar RGB color model light-emitting devicescould also be incorporated into the dash assembly 230 and thus shed it'ssegment chain 400 without deviating from the color changing light aspectof the current invention presented. The plurality of RGB LEDs 210 orsimilar RGB color model light-emitting devices and the plurality ofcircuit boards 220, depending on the requirements of the application,and the physical characteristics of the vehicles dash assembly, could beimbedded into the dash assembly 230, as long as the emitted light wassatisfactorily visible to the driver.

The above disclosure is sufficient to enable one of ordinary skill inthe art to practice the invention, and provides the best mode ofpracticing the invention presently contemplated by the inventor. Whilethere is provided herein a full and complete disclosure of the preferredembodiments of this invention, it is not desired to limit the inventionto the exact construction, dimensional relationships, and operationshown and described. Various modifications, alternative constructions,changes, and equivalents will readily occur to those skilled in the artand may be employed, as suitable, without departing from the true spiritand scope of the invention. Such changes might involve alternativematerials, components, structural arrangements, sizes, shapes, forms,functions, operational features or the like. Therefore, the abovedescription and illustrations should not be construed as limiting thescope of the invention, which is defined by the appended claims.

What is claimed is:
 1. A light source for displaying the rpm of anengine comprising a plurality of RGB light emitting devices.
 2. Aplurality of RGB light emitting devices, as a means for a color changinglight source, for displaying the rpm of an engine.
 3. A plurality of RGBlight emitting devices for displaying the rpm of an engine, arranged inan array wherein one or more RGB light emitting devices sequentially andor progressively illuminate across the array, initially emitting aselected color, and to the extent that the RGB light emitting deviceshave progressively illuminated across the array, all or some of the RGBlight emitting devices that are illuminated, change and emit a differentcolor.